cn.crane4j.annotation

枚举 DuplicateStrategy

java.lang.Object

java.lang.Enum<DuplicateStrategy>

cn.crane4j.annotation.DuplicateStrategy

所有已实现的接口:

Serializable, Comparable<DuplicateStrategy>

public enum DuplicateStrategy
extends Enum<DuplicateStrategy>

An enumeration that defines the strategy for handling duplicate keys.

从以下版本开始:

2.2.0

作者:

huangchengxing

枚举常量概要

枚举常量

枚举常量和说明
ALERT Throws an exception when the key already exists.
DISCARD When the key already exists, discard the new value and old value, return null.
DISCARD_NEW When the key already exists, discard the old key value.
DISCARD_OLD When the key already exists, discard the new key value.

方法概要

限定符和类型	方法和说明
<K,V> V	choose(K key, V oldVal, V newVal) Choose to return one of the old and new values.
static DuplicateStrategy	valueOf(String name) 返回带有指定名称的该类型的枚举常量。
static DuplicateStrategy[]	values() 按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。

从类继承的方法 java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

从类继承的方法 java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

枚举常量详细资料

ALERT

public static final DuplicateStrategy ALERT

Throws an exception when the key already exists.

另请参阅:

IllegalArgumentException

DISCARD_NEW

public static final DuplicateStrategy DISCARD_NEW

When the key already exists, discard the old key value.

DISCARD_OLD

public static final DuplicateStrategy DISCARD_OLD

When the key already exists, discard the new key value.

DISCARD

public static final DuplicateStrategy DISCARD

When the key already exists, discard the new value and old value, return null.

方法详细资料

values

public static DuplicateStrategy[] values()

按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。该方法可用于迭代 常量, 如下所示:

for (DuplicateStrategy c : DuplicateStrategy.values())
    System.out.println(c);

返回:

按照声明该枚举类型的常量的顺序返回的包含这些常量的数组

valueOf

public static DuplicateStrategy valueOf(String name)

返回带有指定名称的该类型的枚举常量。 字符串必须与用于声明该类型的枚举常量的 标识符完全匹配。(不允许有多余 的空格字符。)

参数:

name - 要返回的枚举常量的名称。

返回:

返回带有指定名称的枚举常量

抛出:

IllegalArgumentException - 如果该枚举类型没有带有指定名称的常量

NullPointerException - 如果参数为空值

choose

public <K,V> V choose(K key,
                      V oldVal,
                      V newVal)

Choose to return one of the old and new values.

参数:

key - key

oldVal - old val

newVal - new val

返回:

val